Feeding device for sewing-machines



(No ModeL) T. LAMB.

FEEDI'NG DEVICE FOR SEWING MACHINES.

No. 338,420. P atentedMar. 23, 1886.

Fig.2. 9

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N. PETERS. Pholautbognphur, wmlmmna UNITED STATES PATENT OFFICE.

FEEDING DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 338,420, dated March 23, 1886,

Application filed Septem her 11, 1884. Sn'ial No. 142,757. (No model.)

invention, the cloth-plate being broken away.

Fig. 2 represents a bottom. plan thereof. Fig.

'3 represents a vertical section online 0000, Fig.

1. Fig. 4 is a side elevation of a portion thereof.

Similar letters of reference indicate corresponding parts in the several figures.

My invention relates to improvements in feeding devices for sewing-machines; and it consists of the various details of construction and arrangement of parts hereinafter fully set forth and claimed, whereby the play of the feed-bar is adjustably regulated, and the operation thereof in connection with the other parts performed with a minimum of wear.

Referring to the drawings, A represents the driving-shaft of a sewing-machine, and B the feed-bar thereof. The shaft A is provided with an eccentric, A, and the feed-bar with a yoke, B,which encircles the eccentric, whereby the proper motions are imparted to said bar. Thefee'd-baris formed of asliding rough surface plate or serrated dog, a,which is fitted to a sliding plate, I), the latter being supported on a proper part of the table and connected with the yoke B, said yoke and plate in the present case being formed of one piece of metal. The dog a is lengthened by means'of a bar, 0, connected with the tail end thereof, said bar having formed or connected with it a depending hook or angular piece, 0, the vertical limb d whereof is fitted in a recess, 0, on the side of the plate b, said recess being of such length that the limb dhas a certain play therein in the transverse direction of the machine, it being seen that the bar 0 is 011 the upper side of the plate I), and the horizontal limb f of the hook or piece Oon the under side thereof,

the dog a thus being permitted to slide on the plate 11 and is guided thereon, both the plate b and bar 0 being fitted between lateral guides on the table of the machine, whereby they retain their position on said table. A notch, g, is formed on the hook 0, against which bears a spring, D, the latter being properly secured to the plate I) and operating to force the outer end of the bar ctoward an adjusting-screw,E, which is fitted to the side of the table of the the dog.

When power is applied to the shaft A, the feed-bar is operated and receives its four-way motions, asusual. As the screw E is set relatively to the extent of the feed, it limits the return motion of the dog, it being seen that on said return motion the bar 0 strikes the head of the screw,and is thus rendered immovable. The plate I), however, owing to the recess 6, continues its full return motion without imparting motion to thesaine extentto the doga, unless it is desirable to producestitches of extraordinary length, it being evident that the length of stitches may be adjusted relatively to the length of the recess 0 by properly setting the screw E so that its head limits the return motion of the dog a, the plate I) having, however, the motion independent of said dog, as above referred to.

The yoke B is provided with a set-screw, b, for properly adjusting the same on the eccentric A, and the plate b has secured to it a guide, Z), for theinnerside of the dog a,whereby the latter moves true and uniform at all times.

The screw E is fitted to a bar, E, at the side of the table of the machine, and is vertically slotted, so that by means of screws E, passing through the bar into the table, the bar is vertically adjustable, and when contiguous parts are worn said bar may be raised, and thus proper adjustment of the same maintained. To said bar E is also fitted a screw, E, for tightening the screw E and preventing motion of the latter, especially when in adjusted position.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In the feeding device of asewing-machine, the feed-dog at, having bar 0 attached thereto, said bar 0 having a depending hook, 0, connected therewith ,formed of vertical limb d and machine for adjusting the feed or motions of horizontal limb f, in combination with the slidf and notch g, the plate I), having recess e, :0 ing plate I), having yoke 13, shaft A, having spring D, secured to the plate band bearing eccentric A, and adj Listing-screw E, working against the bar 0, and the adjusting-screw E, in the frame of the machine and limiting the substantially as and for the purpose set forth.

5 play of the bar 0, all of said parts being Elf-- ranged, combined, and operating substantially THOS' LAMB as and for the purpose set forth. XVit-nesses:

2. A feeding device consisting of the dog a, JOHN A. W'IEDERsHEIM,

the bar c,with hook 0, having horizontal limb A. P. GRANT. 

